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Abstract
A series of 5,5′-dialkoxy-2,2′-pyridoins was synthesized by benzoin condensation of 5-alkoxy-2-pyri-dinecarboxaldehydes, and their mesomorphic behavior studied by optical microscopy and differential scanning calorimetry. Several compounds of the series showed enantiotropic mesophases of the nematic and smectic C type.
A spectroscopic study of two model molecules was made and the mesogenicity of the compounds interpreted in terms of intramolecular hydrogen bonding, geometry and degree of electronic conjugation.